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Selective Coordination Presentation Part 1 (pdf)
Selective Coordination Presentation Part 2 (pdf)
GE InstaPlan Excel Workbook

Selective Coordination of Electrical Over Current Protection
Bernie Wright, General Electric

Thursday, 20 November 2008 at 6:30 PM
Clark-Nexsen, Norfolk

Clark-Nexsen
6160 Kempsville Circle
Wing B Conference Room
Norfolk, VA 23502
+1 757.455.5800

Meal Cost (Pizza and soft drinks): Members and guests $5; Students FREE
Presentation: Free

The National Electric Code (NEC) defines selective coordination as the "localization of an over current condition to restrict outages to the circuit or equipment affected, accomplished by the choice of over current protective devices and their ratings or settings." In a well-coordinated electrical system faults are isolated by having only the closest upstream breaker or fuse operate, leaving the rest of the electrical system in operation. Selective coordination requirements have increased with successive revisions of the NEC (NFPA-70) and as of 2008 cover 5 scenarios: health care facility essential systems, multi-elevator systems, emergency systems, legally-required standby systems and critical operation power systems. Achieving selective coordination requires the design engineer to carefully study the ratings of numerous components, as well as coordinate with the electric utility to understand the characteristics of the supply system.

Biographical Sketch: Mr. Bernie T Wright is a Senior Specification Engineer for the Consumer and Industrial Business of General Electric Company. He is a native of New York City. He attended Pratt Institute in Brooklyn, NY and has a BSEE. He began his work career with GE in 1971 with the GE Systems Engineering Group in Harrison, New York. In 1979 he became the Systems Engineer for New York/New Jersey and Connecticut area. Working with consultants to design and layout power systems. One project of note is the power system for the World Trade Centers. He currently resides at the GE Salem, Virginia facility and is the Specification engineer for Virginia.

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